I dont really want to set the exp on kills much higher, ill look into it. I need to modify the bots so they are all higher levels as you have probably noticed there are bots still around lvl5.

If all bots were at lvl 100+ gaining exp would be a lot higher as it is base exp rate * level of target killed. So at the current rate killing a level 120 if you are level 1 is instant level up from 1 kill. Obviously killing a level 5 will have to happen 25 times for the same effect.